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The REAL definition behind X's and O's is this
The first mention in literature of XXX for kisses at the bottom of a letter was in 1901, according to the Oxford English Dictionary. The X itself is very old.

The custom goes back to the early Christian era, when a cross mark or "X" was the same as a sworn oath. The cross referred to the cross of Calvary and the first letter of the Greek word for Christ, Xristos.

Even as little as a hundred and fifty years ago, not many people could read or write. The "X" at the bottom of a document took the place of a signature. They would kiss the "X" as a crucifix or bible was kissed to emphasize the importance of the mark. It was this practice that lead to the "X" representing a kiss.

O is an American thing and represents the arms wrapping around someone.
the person above me believes that everytime a girl signed a letter O that he was getting a kiss, which is why he'll never get laid. X's and O's
by Abennobashii May 13, 2008
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Hugs and kisses. 'X' is for the crossing of the arms when one hugs another, and 'O' is for the shape of one's mouth for a kiss.
Dear Love-of-my-life,
(insert really sappy love letter-type thing here)
X's and O's,
(insert the sappy love letter's writer's name here)
by Jessica Myers June 20, 2006
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